It is what it is.
If the members want a 500 posts/day board, they can get it by posting. That is not the issue. The question is if the pace is sustainable. In other words, more posts will entertain for a while and so more replies will be generated, but unless there is substance of some kind in the posts, the pace will not last.
Drama does not equal a sustainable pace. It causes peaks and lows, depending.
Variation is probably the key. If there is drama mixed with thoughtfulness, spam and whatever, it might work.
And, of course, there's only so much a handful of active posters can do. Even you, McJ, will not keep up posting in those numbers unless you get more of whatever it is that you want. Or think about Cal's recen posts; Cal pops up, briefly achieves his 30+ posts a day routine, then disappears.
What I want? Hang out with friends and acquaintances, I suppose. I2 is largely a virtual pub and that is how it works best for me.